Motion is simply a ratio of space to time, regardless of which is in the numerator or denominator, or what powers are applied to each.
Some of the basic motions are:
- s/t = speed
- t/s = energy
- s/t2 = acceleration
- t/s2 = force
- t2/s2 = momentum
- t3/s3 = mass
Note that motion has nothing to do with "something moving." It is just a generic word for "ratio."